End-thrust facing and fillet cutter



Nov. 14, 1933. l. R. RoBlsoN 1,934,950

END THRUST FACING AND FILLET CUTTER K Filed Jan. 15, 1931 ISM@ R. Robison.

Patented Nov. 14, Y'1933 'Y earner f orties f ND-THRUST FAoING AND 'einem CUTTER Y n Isaac vR.Ro`bison,rv Ionej'Orerg. Application January 15, 1931. serial Ne. 508,936

` j 3 Claims.

AThe tool comprises a cutter Ahead designed to be mounted upon afcutter shaft of thevcharacter described ina' previous invention of'fmine, evidenced-by U'. S. Patent No. 1,740,836;r issued December24, 1929, and entitled a Bearing aligning toolfl'` K "Y This headis providedlv'vith Suitame blades tor facing the ends of the bearings to provide a suitable end-thrust face. Heretofore, devices of this character have had one serious fault and that has been a pronounced tendency to chatter and to make chatter marks on the end faceof the bearings. This fault, most pronounced in cutters provided with radial blades equally spaced from one another, has been partially overcome by arranging such blades at irregular distances from'one another. This last arrangement has not provenA entirely satisfactory. The present invention is designed to entirely eliminate this fault. This ob-k ject is gained by the novel arrangement of the blades with respect to one another and with respect to the manner in which they engage and cut or shear the end face of the bearings.

Y In this instance the cutter head isiprovided with suitable blades for cutting the thrust face,y

and a fillet blade for cutting the Afillet on the bearing ends. Certain blades. are Varranged tangentially with regard to the axisjof thehead, which in this instance Would be the axis of the shaft supporting it, and, in some instances in order to reduce milling costs, the tangential blades may be placed in paired alignment to each other. When so arranged one of the blades shears toward the shaft and the other away therefrom. ther blades are radially disposed with regard to said shaft. This arrangement of the blades has been found to avoid any tendency to chatter. From the foregoing it will be seen that this invention has for its purpose the'attainment of several objects, among which are the following. One object of the inventionl is to .provide a tool of this character that will not chatter. Another object of the invention is to provide a tooly ofv this character with tangentially disposed blades one' of which will shear in one direction and the other. of which will shear in a substantially opposite direction. Y

Other objectsv will become known upon reading thegspecication following, aided by the acey '.companying drawing, lwherein:-`

Figure I is a front elevationof the cutter head.

Fig. II is a side elevation of the head.

Fig.xIII is a fragmentary sectional view of 450`4 ,Y

bearingv and shows the application of the invention thereto. V

Similar numerals. refer to .similar parts throughout the several views.

In the drawing, it will be seen that the Vtool V.-

comprises a cutter head l, having a front or tool face 2 anda'rear face 3. The rear face has an annular hub 4, which is provided with a-bore orV aperture 5 which bore continues through head 1. Y,This'bore serves for mounting the head upon 'a 70HI boring shaft, such as the shaft 6, to which it is held for rotation by a proper keying-device such as a key entering the slot 7. in the hub 4, which being construction well known to those'familiar with the art needs no further discussion. Projecting from the face 2 of the head are a number of cutterblades, and in this instance to simplify the description, but three are shown, 8, 9 and 10 ref spectively, each seated ina slot provided therefor in the head.` Such blades are made of suitable 80,1;- material such as hardenedsteel, and each is provided with asuitably ground cuttingor shearing edge, 8', 9 or 10 as the `case may be. The width of the slots within which the blades seat is such Y that force must be exerted in order to compel 85.. the blades to seat therein, so that theblades, under normal conditions, are firmly held therein.

. Particular attention is now called to the novel arrangement ofthe blades 8, 9 and 10 within the head l. In this instance it will be seen that blade is disposed in a manner that it intersects or extends into the bore 5 non-tangentially, and that blades 9 and 10 are arranged tangentially with regard thereto, and also vthat there is no regularity or equality of spacing between the blades. This irregularity of spacing the blades aids materially in preventing chatter and chatter marks upon the end face of the bearing which is being prepared for end thrust. However complete elimination of chatter is obtained by the disposition of blades 9 and 10 with respect to blade 8. It will beseen that these blades are tangentially arranged with regard to bore 5, and that they are in alignment with oneanother. However, it is to be understood that-it is not nec-.- essary for the tangentially arranged blades to be in alignment with each other, it is merely done in this instance because it greatly simplifies the .milling of the slots within which they are seated.

If the head '1, as shown in Figure I, rotates to the left or counter clockwise, blade 9 will shear toward the bore 5, and blade 10 will shear away therefrom. It will be seen that there is little likelihood of chatter, which is occasioned mostly by equally spaced radially disposed cutter blades. By this arrangement of the cutter blades chatter marks made by any one blade will not be intensified by the remaining blades, but to the contrary will be eliminated thereby.

In addition to the blades 8, 9, and 10, the head 1 is constructed to receive the adjustable filled cutter or blade 1l. This blade is adjustably seated in the slot l2. The slot 12 is arranged so that blade 1l can be moved to and from the bore 5 in order to accommodate it to the varying sizes of bearings. Blade 1l is provided with a portion 13 for cutting the fillets on the bearings. Set screws 14 are threaded into the head from one side thereof and engage the blade 11 and when threaded up secure it against movement. This is, of course, done after it has been placed in a suitable position for lleting. Blades 9 andV 10 are provided with beveled ends 15 and 16re spectively to allow them to conform to shaft 6.

Figure III shows the device in operation facing the bearing 17 which is held in the seat or saddle 18. This View also illustrates the fillet 19 cut by the blade 11. lIn this instance the device is being used to ace the end of the bearing 17 for end thrust. v

Having vdescribed my invention, what I declare as new and desire to secure by Letters Patent, is-

1. In a'tool vdesigned for cutting end thrust facings upon bearings, wherein such tool consists of a cutter head provided with a bore for mounting -it upon a shaft and a face from which projects cutter blades, the arrangement of such cutter blades which consists in arranging certain of said blades tangentially with regard to said bore, and in alignment with regard to one anothenand arranging4 other of: said blades nontangentially with vregardto said bore.

2. In a tool designed for cutting end thrust facings upon bearings, wherein such tool consists of a cutter head provided with a bore for mounting it upon a shaft and a face from which projects cutter blades, the arrangement of such cutter blades which consists in arranging two thereof tangentially with regard to said bore, arranging'a third blade radially with regard to said bore, and providing an irregularity of spacing between such blades.

3. In a device of the character set forth, a cutter head provided with a bore for seating it upon a cutter shaft, said head being provided with acutter face, a plurality of cutter blades seated invsaid head and projecting from said face, certain of said blades being positioned tangentially with regard to said bore, other of said blades being positioned radially with regard to said bore, and said head being provided. with a slot opening out of the face thereof and extending toward and intersecting said bore, and constituting a seat for an adjustable llet cutter.

l ISAAC R. ROBISON.. 

